Process Design and Multi-geometric Parameter Optimization of Large Cones Based on Response Surface Methodology

doi:10.3901/JME.2019.24.083

Abstract

Abstract: A necking forming method suitable for large conical parts is presented in this paper, the axial necking force of the necking forming is compared with the necking force of the standard straight wall cone by the principal stress method and the best forming scheme is obtained. And based on Deform and Response Surface Method, the effects of the generatrix chord height χ of the necking die, the ratio of straight part and space part l/h and workpiece wall thickness S₀, the size of variable wall thickness λ on the height of the formed part and the necking forming force are respectively discussed. Then, regression prediction model with two response variables for each of the four independent variables is obtained and the best geometric parameters of the straight & space structure and the workpiece is optimized. Finally, it is verified by physical experiments. The results show that when χ=6.9 mm, l/h=0.3、S₀=29.5 mm, λ=4.8 mm, the workpiece does not destabilize during the necking process, the maximum necking force is 1 920 kN, and the measured formed part height is 1 108 mm, the error with the model prediction result is less than 10%, which indicates the feasibility of the necking die and workpiece structural parameters in the process scheme. The forming process and the die structure will provide theoretical guidance for the necking forming of large cone products.

Key words: cone part, necking forming, necking force, formed part height, response surface

CLC Number:

TG312

WU Ang, WU Ying, LI Guojun, LI Xubin, ZHANG Zhimin. Process Design and Multi-geometric Parameter Optimization of Large Cones Based on Response Surface Methodology[J]. Journal of Mechanical Engineering, 2019, 55(24): 83-92.

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